I had not started this work as a book. My first guide had been created as a patient handout about thyroid disease. My need was practical and simple. I see the patients every day in a clinical setting, and every day, I must give an explanation about the same health problems. This experience helped me to identify the gaps in common knowledge typical for many people. It is not easy for a person without a medical background to grasp all information in a time-limiting and highly stressful environment of a doctor’s visit. My goal was to create a simple but meaningful guide with essential information that the patient can take home, read without rush, and then plan the changes she or he needs to do to take control over the disease.